Laser-induced plasma analysis of ammonia-oxygen and ammonia-oxygen-enriched-air flames at elevated pressures

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2024-10-17 DOI:10.1016/j.combustflame.2024.113803

Bilge Kaan Gokcecik, Nagaraju Guthikonda, Aleksander Clark, Peng Zhao, Zhili Zhang

引用次数: 0

Abstract

This study employed Laser-induced breakdown spectroscopy (LIBS) to measure the fuel-oxidizer ratio (FOR) of ammonia combustion with oxygen-enriched air and pure oxygen flames at elevated pressures (100 - 300 kPa). The correlations between the spectral line intensity ratios of nitrogen (N), hydrogen (H), oxygen (O), and equivalence ratio were used to quantify the FOR of flames at various pressures. The effect of pressure on the stability and precision of the calibration profiles for the elemental intensity ratios in flames was investigated. It was observed that the H/O correlation decreases with pressure increase for both ammonia flames. N/O correlations decrease with elevated pressure for the ammonia-oxygen flame. Furthermore, the nitrogen (N_II) spectral emission lines at 568 nm and 595 nm were used to estimate the plasma temperature, while the hydrogen (H_α) line at 656 nm was used for electron number density measurements.

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高压下氨氧和氨氧富集空气火焰的激光诱导等离子体分析

本研究采用激光诱导击穿光谱（LIBS）测量了氨与富氧空气和纯氧火焰在高压（100 - 300 kPa）下燃烧的燃料氧化剂比（FOR）。利用氮（N）、氢（H）、氧（O）光谱线强度比和等效比之间的相关性来量化不同压力下火焰的 FOR。研究了压力对火焰中元素强度比校准曲线的稳定性和精确性的影响。观察发现，对于两种氨火焰，H/O 相关性随着压力的增加而降低。在氨氧火焰中，N/O 相关性随压力升高而降低。此外，波长为 568 纳米和 595 纳米的氮（NII）光谱发射线被用于估算等离子体温度，而波长为 656 纳米的氢（Hα）光谱发射线则被用于测量电子数密度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Combustion and Flame 工程技术-工程：化工

CiteScore

9.50

自引率

20.50%

发文量

631

审稿时长

3.8 months

期刊介绍： The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.